-16+x=-5 
-16 is the opposite of 16
X is the unknown number( variable) 
-5 is the result
        
                    
             
        
        
        
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Explanation:</h2><h2>
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Because we perform something like common factor, so this guarantee that corresponding digits have regarding coefficients have the same place value. Remember that a number written in scientific notation is given by the product of a number between 1 and 10 and another number that is power of 10. For example, let's write two examples about this:
Addition:

Addition:

Subtraction:

 
        
        
        
Answer:
36, 49, 64
Step-by-step explanation:
6 squared, 7 squared, 8 squared makes 149